Lamp guard



A IIIIIIIIIAIII June 10; 93 J. MANNESCHMIDT, JR 1,762,724

LAMP GUARD Filed June 21, 1928 2 Sheets-Sheet 1 INVENTOR r Jag; mos/172650717771 ii-J r.

, Jlrih-evlo, 1930- J. MANNESCHMIDT, JR

LAMP GUARD 2 Sheets-Sheet 2 INVENTOR v Jacg mannesdvmilt I AQQRNEYS Filed June 21, 1928 Patented June 10, 1930 JACOB MANNESCHMID'I, JR.,

PATENT QFFICE OF BROOKLYN, NEW YORK LAMP GUARD Application filed. June 21,

This invention relates essentially to a lamp guard of that type in which a metal cage encloses an electric incandescent lamp bulb so as to prevent accidental injury thereto and c to secure it against loss by theft or otherwise.

The invention is designed to provide means for mounting the cage on the socket of an electric outlet box or to the socket of a portable lamp holder or other electric light fixlc tures.

An object of the invention is to provide devices whereby the cage by a simple twist or rotation thereof in an arc of a circle concentrio with the axis of the lamp is automatically 15 locked to the socket and cannot be unlocked without a key specially fitted for that purpose.

Another object of the invention is to avoid the use of any threaded arrangement for se- 20 curing the cage to the socket, as it has been discovered that the threads soon corrode making it diificult to screw one part into another.

In the present invention, all screw threads 2 for attaching the cage to the electric light socket are eliminated and the cage is securely locked to the socket by means of a hook and lug connection coacting with a spring bolt.

One advantage of the latter arrangement is 30 that the cage can be perfectly centered over the bulb before it is locked to the socket.

The novel features of the invention are more fully described in the following specification and claims and illustrated in the accompanying drawings in which Fig. 1 represents a vertical section showing the lamp guard locked to the outlet box.

Fig. 2 is a horizontal section taken along the line 22 of Fig. 1.

Fig. 3 is a detail vertical section showing the hooking devices.

Fig. 4 is a detail front elevation of the lowor part of the cage showing the locking bolt.

Fig. 5 is a vertical section showing the guard locked to a portable lamp.

In the drawing the numeral 6 designates an outlet box which is adapted to be secured in the wall of a building as is well known. The cover 7 of said box has mounted thereon as indicated in Fig. 1 the usual porcelain elec- 1928. Serial No. 287,182.

tric lamp socket 8 and bulb 9 is screwed into the socket in the usual way.

Aguard for protecting the lamp bulb from injury or romoval comprehends a cage preferably cast of aluminum having an annular base 10 provided with a series of lugs 11 projecting inwardly from the base and a series of toes 12 extending outwardly give additional support to the base when it is locked. From the base project a number of vertically disposed guard members or bars 14 having a horizontal connecting band 15 and domed top made to loop about the lamp bulb with out touching it. I

The locking devices for the cage comprises a spring bolt 16 fitted in the base of the cage and the bolt has a flanged member 17 suitable for coaction with the bit 18 of a key shown in Fig. 4. The spring normally presses the bolt outward so that the end will project below the base of the cage.

A plate or disc 19 fixed to the socket is fastened to the out-let box cover by means of screws 20 as indicated in Fig. 1. The disc carries a series of hook members 21 made to engage the lugs 11 on the base of the cage. The plate is equipped with a plurality of holes 22 any one of which will serve as a keeper when the bolt is in register wit-h it.

As shown in F 5 the cage is connected to a portable lamp which has a handle 24 and plate or disc 25 is fixed to it by a screw 26 engaging a depending sleeve 27 extending from the plate. The screw also fastens a :orcelain socket 528 into the sleeve and a lamp bulb 29 screwed into the socket extends upwardly. The cage is locked to the sleeved plate in a similar way to that illustrated in Figs. 1 to 4 inclusive.

In the foregoing devices the hooks are concentric with the axis of the socket so that when the base of the cage is placed onto the plate 19 it will be in perfect alignment with the axis of the lamp and a quarter turn of the cage will bring the lugs into engagement with the hooks. In order to prevent backward or retrograde movement of the cage and consequent disengagement of the hooks from the lugs the lock bolt snaps into engagement with one of the holes. When it is desired to unlock the cage the key is inserted into the key hole shown in Fig. 4, then turn to the right until the bit strikes the flange 17 thus drawing the bolt out of the hole and compressing the spring thereby permitting the cage to be turned bringing the lugs out of engagement with the hooks.

I claim r 1. In a lamp guard the combination with I a socket, of a plate with a depending Sleeve,

means for fasten-ing, the sleeve to the socket,

a handle secured by said means to the sleeve, I a cage arranged on the plate, means for hooking the cage to the plate by revolving it in an arc of a circle, and a spring1 bolt broughtinto action when the cage is ooked to the plate for locking it to the plate.

2. In a guard for lamps the combination with a socket, of a plate having a series of holes fixed to thesocket, a cage with lugs for attaching it to the plate, a' spring bolt fitted in the base of the cage, the spring thereof normally pressing the bolt outward by its expansion so that the end projects belowthe base of the cage, but when the cage is attached to the plate the end of the bolt autoy matically engaging! one of the holes and thereby locking the cage against retrograde movement, a flange on the bolt made to coact with the bit of a key whereby the bolt is retracted to unlock the cage.

81 In a lamp guard the combination with a socket, of a plate with a depending sleeve encircling the socket, a handle having a recess surrounding the sleeve, a screw for fastening the handle and sleeve to the socket, a cage arranged on the plate, means for hooking the cage to the plate, and a bolt for locking the cage to the plate.

I Y testimony whereof I have hereunto set my hand. y

JACOB MANNESCHMIDT, JR. 

